Well, I started with the 6 plus as my media/gaming phone and had the HTC one m8 as my work phone which I use mainly for calls. I then got the Note 4 as my media phone and switched the iPhone over to my work phone and found it better as my work phone, I have a lot of clients with iPhone's and it was easier with FaceTime and imessage. I got tired of carrying 2 large phones, and tried the GS6 as my work phone with my 6plus as my media phone again, but really missed my note 4, so I then traded my GS6 for a regular iPhone 6 and paired that with my note 4 and it was great. The 6 plus I kept and plan to give it to my son. Now I upgraded to the Note 5, and last week sold my regular iPhone 6 to buy the 6S and began using the 6 plus again.
Though now I'm torn again whether I should stick with my original plan or get the 6S Plus instead. It might be because I haven't had to carry both large phones around that long, I did get sick of it before, but my other train of thought is that I may be moving in which case I would only carry one phone again, and with my apple watch and apples ecosystem I may just stick with the iphone, even though I love my Note 5. And if I'm only going to carry one phone I would prefer the 6S Plus over the 6S.